I am thinking about developing such a beast. But there are some parallel developments - not sure if the results of them will be free.
If there will be a free design available soon, it is a waste of time to develop another one. (Takao's hw design is effective and simple, if he publishes the final code too, hard to make anything better...)
And here is your and KreAture's work too.

If your and the other designs are not planned to be free, it is more interesting for me to develop a publicly available free one.

I did know about the open source project, but never really had a look at it. My initial thoughts at that time was that this developmental project was aimed a robotics and probably Robot Wars. The supplied links above pretty much confirmed my initial thoughts and to be really honest, there is nothing there that caught my attention. The controller board is way to big, but as you already said, it could be made smaller. But if one is to go to the trouble of reducing it (I suspect you will still not get it small enough) you might as well do your own thing if you have the ability.

Never the less, there are people out there that do not have all the required skills, and will find this project helpful, as no doubt, many have. Well done to the Yahoo group people for doing what you have done. Great to see you guys pull this one off.

Mmormota

You should go with you idea, as you never know what might happen to possible competition to your idea. You may be able to do it better and simpler and therefore have the advantage. At present, I do not know what I want to do with mine when I have it 100% finished… which should be in a months time. I suspect mine is a little too difficult for the average home constructor due to 0603 caps/resistors and fine-pitched devices. My new PCB is reasonably tightly packed in order to keep size as small as possible. I was considering supplying the local market at home with built units, as standard commercial ones are very expensive. Time will tell.

BUT ... the data sheet says that a suitable clock frequency must be chosen between 50 - 200 KHz to drive ADC module. So at 200KHz, that results in 5uS x 13 clocks = 65uS. I suspect now that this 'conservative' figure is for low power consumption and what works best for 10 bit resolution.

Maybe I should try some radical over clocking tonight and see.... Thanx for the feedback Takao.

O, oo...
I made a mistake written.
It is "LMH6643", rail to rail full swing OP amp.
This device has 100mA drive capability with 130MHz responce.
Good enough for any high input capacitance FET drive as high current motor drive.

Since I am new to all this, this may not get through ! I logged on beacause I felt sure there may be some way of making a cheap DIY Brushless controller -- but looking at all the messages about this it seems to be beyond me! I am building a 42" span electric Lancaster with 4 KP02 motors off 8 cells. the motors are only marginal, and having experience of other brushless models, wondered if 4 small brushless (CD-Rom? )motors would do -- but 4 speed controllers? is it possible to run more than one brushlees from one controller, if the motors sere "fired up" one by one, and "caught" before each one had stopped spinning? I suppose we all want something cheap! Bolton Barry